Plankton nets are indispensable tools for studying the biological diversity of the oceans. They capture plankton, microscopic organisms that form the base of the ocean's food chain. These organisms are crucial to understanding the health and functioning of marine ecosystems.
To avoid any inconvenience during your research, it's vital to make sure your plankton nets are in good condition before heading out into the field. Here are ten things to check before using your plankton nets for field work.
1. Net material
Check that the materials used in the manufacture of your plankton nets are durable and seawater resistant. A damaged net can lead to inaccurate results and can have a negative impact on your research.
Nylon and polyester are commonly used materials for plankton nets. Nylon is strong, durable and resistant to most chemicals, making it the most common option. Polyester is lightweight and easy to handle.
2. Dimensions (opening and length)
Choose the size of your plankton net according to your research objectives. A larger net may capture more organisms, but it may also be more difficult to handle and create drag.
Standard plankton net sizes range from 0.5 to 1 meter in diameter. However, the size may vary depending on your research objectives. For example, if you're carrying out research based on a previous study, you'll need to acquire nets with the same specifications as those used in the study.
Made-to-measure nets can vary in diameter from 20 cm to 100 cm, with a ratio of 1:3 to 1:7.
3. The mesh
The mesh size of your plankton net will determine the size of the organisms you catch. Check that the mesh size is appropriate for your research objectives. You should always aim for a mesh size slightly smaller than what you're trying to catch.
Mesh size can vary from 1 micron to 5000 microns. The smaller the mesh size, the smaller the organisms that will be captured. However, a smaller mesh size can also lead to drag and reduced start-up.
4. Net fastener
Check that the ropes and knots on your plankton net are securely fastened and that the net is properly secured to the frame. Make sure all your equipment is properly installed and free from corrosion. Check all fastening points for weaknesses or damage.
Make sure the net is taut and free of any kinks. Tie knots and ropes securely to prevent damage or loosening during towing. Be sure to use marine-grade shackles and hardware.
5. Spindle ring material
The frame of your plankton net should be made of a durable, corrosion-resistant material. Check that the frame is in good condition, and that there are no cracks or damage. The frame provides support and stability during towing. Aluminum and stainless steel are the most commonly used frame materials. Aluminum is light and easy to handle, but can corrode in seawater if not properly maintained, and is more complicated to repair at sea, as it requires advanced welding skills and equipment. Stainless steel is more durable and corrosion-resistant, but heavier and more expensive. Stainless steel should always be your first choice.
6. Frame size
Choose the size according to your vessel's towing capacity, the opening of your net and your search objectives. A larger frame may allow better water flow, but it can also be more difficult to handle, especially in rough sea conditions.
7. Collecting bucket
The collection bottle is where the captured organisms are stored for further analysis. Check that the collection bucket is clean and free from cracks or damage, and that the filter mesh is properly attached and sealed. It should be made of a durable material, such as ABS. Clean the bottle before and after use to avoid contamination.
8 Replacement equipment and carry bags
There's nothing more annoying than having to stop your project halfway through because of damage to your equipment.
Always make sure you have extra replacement equipment on hand to avoid any interruption to your search. You should always have one or two spare nets and buckets.
What's more, although plankton nets are generally of very high quality, it should be noted that due to the nature of their fabric construction, they are very fragile. The time when they are most likely to be damaged is during transport. That's why it's always important to buy carrying bags for your nets, to minimize the risk of damage between samplings and on the move.
9. Towing speed
Check that the towing speed of your plankton net is adapted to your research objectives and within the recommended range.
Towing speed can affect the size and quantity of organisms caught, as well as the quality of the sample. The recommended towing speed for plankton nets is between 1 and 3 knots. Monitor towing speed during towing and adjust if necessary to maintain a constant flow.
10. Safety equipment
Make sure you have all the necessary safety equipment, such as life jackets, first-aid kits and communication devices.
Field work can be unpredictable and dangerous, especially when working on the ocean. The necessary safety equipment helps prevent accidents and respond to emergencies. Check safety equipment before use to make sure it's in good condition and working properly.
Conclusion
In conclusion, to ensure the success of your sampling, it's essential to check your plankton nets before you start. By ensuring that the net, attachments, frame, bucket and safety equipment are in good condition, you can ensure that your research will be more productive, safe and accurate. Proper maintenance of your plankton nets not only improves the quality of your research, but also extends the life of your equipment. Enjoy your sampling!
